using System;

using Org.BouncyCastle.Asn1;

namespace Org.BouncyCastle.Asn1.X509
{
	public class AttCertIssuer
		: Asn1Encodable, IAsn1Choice
	{
		internal readonly Asn1Encodable	obj;
		internal readonly Asn1Object	choiceObj;

		public static AttCertIssuer GetInstance(
			object obj)
		{
			if (obj is AttCertIssuer)
			{
				return (AttCertIssuer)obj;
			}
			else if (obj is V2Form)
			{
				return new AttCertIssuer(V2Form.GetInstance(obj));
			}
			else if (obj is GeneralNames)
			{
				return new AttCertIssuer((GeneralNames)obj);
			}
			else if (obj is Asn1TaggedObject)
			{
				return new AttCertIssuer(V2Form.GetInstance((Asn1TaggedObject)obj, false));
			}
			else if (obj is Asn1Sequence)
			{
				return new AttCertIssuer(GeneralNames.GetInstance(obj));
			}

			throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
		}

		public static AttCertIssuer GetInstance(
			Asn1TaggedObject	obj,
			bool				isExplicit)
		{
			return GetInstance(obj.GetObject()); // must be explictly tagged
		}

		/// <summary>
		/// Don't use this one if you are trying to be RFC 3281 compliant.
		/// Use it for v1 attribute certificates only.
		/// </summary>
		/// <param name="names">Our GeneralNames structure</param>
		public AttCertIssuer(
			GeneralNames names)
		{
			obj = names;
			choiceObj = obj.ToAsn1Object();
		}

		public AttCertIssuer(
			V2Form v2Form)
		{
			obj = v2Form;
			choiceObj = new DerTaggedObject(false, 0, obj);
		}

		public Asn1Encodable Issuer
		{
			get { return obj; }
		}

		/**
		 * Produce an object suitable for an Asn1OutputStream.
		 * <pre>
		 *  AttCertIssuer ::= CHOICE {
		 *       v1Form   GeneralNames,  -- MUST NOT be used in this
		 *                               -- profile
		 *       v2Form   [0] V2Form     -- v2 only
		 *  }
		 * </pre>
		 */
		public override Asn1Object ToAsn1Object()
		{
			return choiceObj;
		}
	}
}
